Effluent is defined as including both the solid and liquid excreta produced by pigs. This also includes the straw or sawdust used for deep litter bedding. It should be noted that, in line with the definition in EnviroPork, ‘effluent’ becomes ‘manure’ when applied to land. This distinction is important, in that when applied to land pig manure can provide significant benefit to the soil and pasture/crop both as a fertiliser and a soil conditioner. There are potentially three stages effluent goes through on a piggery in New Zealand (see flow diagram, see link below):
This includes the different systems of feeding the pigs as well as the disposal of carcasses. This stage effectively deals with the way pigs digest feed and water and what affect this has on the excreted material.
This stage describes the processing and/or storage of effluent so that it can be applied to land and/or water at the appropriate time. This may include solids separation, biological treatment, storage/composting of solids and carcasses.
Once the effluent has been processed and/or collected, most New Zealand farms then apply the effluent back to land as manure in either liquid or composted solid form. There are also farms that apply manure fresh (within 24 hours of flushing out of the buildings), bypassing the second stage.
Download the Effluent System Diagram.(PDF 18KB)
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